This is the 4687th most frequent Polish word.
napisać
"Napisać" means "to write."
The word 'napisać' is used here as the infinitive form meaning 'to write', indicating the intent to perform the action of writing.
Chciałem napisać list do przyjaciela.
I wanted to write a letter to a friend.
The word 'napisała' is the past tense form of 'napisać', specifically third person singular (female gender), referring to the completed action of writing.
Ona już napisała swój egzamin.
She has already written her examination.
The word 'napisać' here is an infinitive indicating the action of writing, used in the context of requesting permission to perform the action.